Apply renamed plugin package

Due to recent Github related naming convention applied to Shipkit Changelog plugin, the referenced 'org.shipkit.shipkit-gh-release' package should be changed for 'org.shipkit.shipkit-github-release'.

Author: shestee

gradle/shipkit.gradle

@@ -1,6 +1,6 @@
 apply plugin: "org.shipkit.shipkit-auto-version"
 apply plugin: "org.shipkit.shipkit-changelog"
-apply plugin: "org.shipkit.shipkit-gh-release"
+apply plugin: "org.shipkit.shipkit-github-release"
 
 tasks.named("generateChangelog") {
     previousRevision = project.ext.'shipkit-auto-version.previous-tag'